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Sets the values of a javascript object or array using a chain of colon separated keys.
function set(obj, keyChain, value) {
var keys = keyChain.split('.');
var key = keys.shift();
while(keys.length) {
obj[key] = obj[key] || (isFinite(keys[0]) ? [] : {});
obj = obj[key];
key = keys.shift();
obj[key] = value;
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